Fuse



Nov. 8, 1932.

E. BLOMQUlsT FUSE Filed Aug. so. 1930 5 Sheets-Sheet l Nov. 8, 1932. E. BLoMQulsT 1,887,369

FUSE Filed Aug. 30, 1930 5 Sheets-Sheet 2 Nov. 8, 1932. E. BLoMQulsT 1,887,369

FUSE

Filed Aug. 30. 1930 5 Sheets-Sheet 3 Qj@ Q @9.6.

. ZV 5/ V fj QM l' Mmm) @W Nov. s, 1932. A E. BLOMQUIST 1,887,369

FUSE

Filed Aug. 5o,- 19:50y 5 sheets-shea 4 M' QQ- 75- M@ WWM @www Nov. 8, 1932, E. BLoMQUlsT FUSE 5 Sheets-Sheet 5 Filed Aug. 30, 1950 Patented Nov. 8, 1932 essie@ LSSLSSQ ERNST BLOI'K'QIST, 0E LOMBARD, LLINGS Application. filed 30, i930.

rlhis application is e continuation iii port of my pending application, Serial No. 366,2?3, iiied l-.ley 27 1929, mid relates iii general to fuse h both of oil oi' ot disconnect switches and the Voltage side. Th; 'esi' nits the .l ii Aches one fuses th or the ssii The fuse usea iii.;

glass tube il; e .L with eei'hon te otliei iiisuif J. o pi'ovidod with Lie-allie ei'iules terminals. Then suoli Yeiy heavy frequently shettes the in the immediate V e he prevented und-ei" uil e Vent this oeouiienee it l iii the post,

n between the I yo allow a eoxsi use and i i is obj T lei able speci i grounded oi* liv eetionehle WheyV a compact ai'oiigeiiient is desiied,

popose to mount the fuse Within s tool: of oil oi other insulating liquid. eine tool; Wlieieiii the Y i disconnect switches aie mounted, said switches being also meised in the oil hath. Shouid the fuse blow Serial We. $28,833.

undei the ext-11eme conditions iesuiting iii the of the glass then the oil will effeetive y prevent the spi-ziclihg oi" en are ioiii the fuse to the other grounded oi1 live peus ii tli tank. Because of the pieseiie 5 V is possi to mount the various et-hei' While ietsiiiino' t piits oloseij tog i .i n the same degree 03": seletji heretofore maintained With gi* eter spacing.

der which I e; vide e. iiovei i i n the oil both zuid is 1 a fuse. ,L ues et the lird esseiiif mouied in eii upiully upi si The Y, Peioie comprises "h' open et the top fo Coi feiil iles eie pro e fuse theieiu en eleetieal eoiilieotion is established between thev 'leise and the 70 oi'i'ules on tlie holder. It

1 may hepoeii that the sheteed upon the el rein-elif Violent eoii giess Twill be eof under l this tube of insulation wli i he removed. Even upon the o i e nonviolent blowing of the inse, when the glass is not shattered, e Vent esp Witi Whioh the fuse is provided is blown out iii oidei to mit the eieope of the gaseous products of oii uit inteiiuptioh. After o iiumhe of si circuit interruptions it is i^eesseij,f to elesii tl e holdei' of such have zieoumulfitd.

holder pieseiits e spes loe teken iuto design of the fuse holder s Compl t insulating' oil oin @the it objeetioiiol-le il.' tie opemtoi to he req 1' ieiuoving the same. the danger involved tu. being; mounted oiitdoois7 it Voi" i possible to insert the houd into the oil one remove the fuse holder.

To overcome the necessity of inserting the hand into the oil, or even into the oil casing, during the removal or mounting of the ruse, I provide a simple and efficient mounting construction for the `fuse holder and a simple tool tor manipulating the fuse holder during the process of inserting the fuse holder in the casing or removing it therefrom. This mounting and manipulating tool I consider new; rIhe mounting means comprises a stationary insulator mounted within the tanlr and having at the top thereof a line terminal which is electrically connected in the desired manner. This terminal is adapted to receive and hold the end of the tuse holder which may be screw threaded thereto. rIhe fuse holder has a Contact clip mounted therein at its lower end which contact clip is electrically connected to the terminal upon the mounting of the fuse holder on the insulator support. The contact clip is adapted to receive the lower errule of the fuse when the same is inserted into the fuse holder. Means is provided 'for limiting the extent ot turning of the fuse holder as it is threaded into the support whereby the radial location ot the clip and other parts of the fuse holder is definitely predetermined.

The upper end of the fuse holder is provided with a Contact for establishing a circuit with the upper end of the tuse. Connections are established to this upper' Contact by means of a removable contact clip which is connected in circuit by means of flexible braided conductor. Before the fuse holder can be removed from the casing 'this contact clip must be removed therefron rIhe tool or operating rod that is provided for manipulating the fuse receiving tube is also provided with means for manipulating the contact clip thereby obviating the necessity of inserting the hand into the oil for this puropse.

For inserting the fuse into the fuse holder I provide means for gripping the upper one of the fuse ferrules and firmly holding the same, said means constituting a means for establishing aI circuit to the upp JLerrule. The fuse gripping means may be provided with an insulator having a handle at its opposite end or it may be provided with means whereby an insulated handle may be removably attached thereto. In either event the fuse is irmly gripped and by means or" the handle it is lowered into position in the fuse holder.

flnother feature ot my inventi n lies in the provision ot' means for pushi o the contact clip into full electrical engagement with the upper contact ot' the fuse holder upon the insertion of the fuse into position, in the event that it had no'U previously been fully pushed into position. This means comprises a member projecting from the device that holds the fuse as it is being lowered into position. This projecting i -ember abut-s against the top, of the Contact clip if the neszaee same has not been pushed into its fully operativo position and upon continued downward movement ot 'the projecting member it forces the contact clip into its full engaging position. This projection. also prevents r^- nio-val of the contact clip from engagement with the upper terrule ot the fuse holder while the fuse is in position. rl`his is or" importance in that if the Contact clip w re removed wl ile the fuse is in position th clip might be called upon to interrupt the line charging current, a function which it ifV desi ced to have. i order to acquaint those skilled in the with the manner ci' construction and opcrati on oi a crevice in accordance with my invention, I shall describe, in connection with -i w ...f2.7 11... tue accompanying di au ings, a low *,Jieieiied embodiments thereof illustrating the principles of' my invention.

I vings:

is a sectional view of an oil switch- .g i within which my in'proved fuse holder is mounted;

figure 2 is a longitudinal :tional view oi my improved fuse holder with the fuso inserted in place;

Figure El is a longitudinal view throu 1holder, said view bei -g to the section of Figure 2; Figure is a 'fragments ry perspective view ot a portieri or" the chuck mechanism for the upper terrule ot the fuse;

Fig :e is a fragmentary view showing the manner in which the contact clip rethe fuse hold fr;

a fragmenten-,f elevational view 3 the lne ot ltr, re 7 and by the Contact clip er wher" tions with the upper termi- "ragment ry pla view of a use holder, srd viev f contact clip;

engaged by the r. view showing the manner euse holder is engaged by the j iol: for removing the Juse holder tro i the oil tank;

fl is a view of a tool used for inor removing the Jfuse holder from the oil t 1nir;

i? ure le is a perspective view ot a clip used in connection with this form oit fuse holder;

Figure l5 is a fragmentary partial secshowing Y f the subject matter of the present ie fuse holder is indicated in refe ence numeral T8. ctois extending the ci cuit to o shown in Figure l are ie switching tank by means of The iotlieadN for the Xtended to the rence numeral 50. to one upper portion Y-ans s'iitablo bolts ei;-

The portion of tional View of a inodiiied form of fuse holder, said View showing the upper portion or" tio holder with a fuse inserted in `position;

Figure 16 is a finement-ery sectional vier,7 of the fuse holder shown in Figure l5, said View being taken at right aiigies to die section of Figure 16; and

Figure l? is a sectional View ta :en along the line 1?-'17l of Figure l5.

In order to more clear`y understand tif present invention reference ii ay be had ii showing to Figure i an oil switching t ruse holder i Within which my improved lli iic Within the casing, mounted and showin fie manner of Lio-mitM o reiE rence numeral 52, ing the same. The switch tank is indicated i inthe usual use or' potby the reference numeral. 3 i iid if supported ard direction. A

tends intothe 1poti oid of tno pot-head e to connecting; a

by suitable I-beams 4l.

made of she-et steel and is at the corners by means Horizontal cross bars e A ictor. This conangles to the piane oi" thV e f e a in any preierred man l are mounted Within the on taiiland suno6 wliicii mai be oi: bar coiieer 1 l .1 port insulating' poneis iG-io upon Wiicli toe dese- 'ie ri: ieriai is also seswitch contacts ll, l2, and i3, and ll7 i2 crier oi the pot-head for a filo/1, il me, t 1mi of mi il` ii anL o meioounrec. imoswi li o inoie iiiiiy eipiaiiiec iieiete and 20, cooperate with the co itacts f tablishingr the desired ciici, it. 'l

i r housing` 3 are or" the pliiiiger type and are e apte iboire each oi the be luneed i/'eiticalrY from en m nent ii the ii tio-ii 1 J y x tno contacts li-lQ to engagement i es from tiie cabinet. contacts The switch upon the top of i i 's and mrl Y, e? v older, vper or other s d," cao secured thereto at opp/os ,l i ower @ne of the Contact strips is indicated be and another one of these strips is indi froat 26. lien the switch is 'on this shown the contact strip Q5 esf` i tof from thence nection between the contacts l as the Contact strip is no r 'p in the operciroiiit being insulated from t strip tl ysten wherein the l,Vheii the swith E20 is iowiis" tant: f ligire l is used, the Wardly, the Contact 25 est ciecti eu o th cil or other st itz ble liquid trical connection between 'the Contact l2 and h l .siii

the contact. 13 but it does not coi sr to e ley the contact ll, which Contact is l a use held gagged by the Contact strip 26. Since struction of the sw'iteh as Well as t. 't connections Controlled thereby is shoiiii fully in my parent a iplication above reia ler coioirises a l/ struction or itablo insulatto and since this particular consti' ic iiioi ted the constitutes no part or" the invention clainie; il fiber disc 101 tube 100, said in it is believed that a further desci thereof is not necessary and refer be had to my above referred ajLiolicatioii ioi -i t1 a further description of the particular construction of the switch and the inouiitirfl ler is inoui ed into the means therefor as Well as the circuit coiitliet li iiection controlled thereby. ago f the oil roin Al b let 4^ iid an upper bi are secured to the rear side oiI the iiisula ig of the tube and supports 1ianel 'l0 and provide a support for an Y, a ee Lbiv 2 0. A threaded sulator 17 su oortine' the ruse nolder conis secure-d t the Lilo i* 10' and extends outwardly therefrom. A pair of lock nuts 108 and 109 are threaded onto the spindle 107, and the spindle 107 is threadedk into the supporting insulator 77.

The lock nuts are tightly locked upon the spindle and are adjusted to such a position as to accurately, tix the extent to which the spindle may be turned into the insulator 77. The insulator 77 is provided with a metal cap 110, which extends into the insulator and is cemented therein, said metal cap being internally threaded to receive the spindle 107. The insulator 77 is mounted in the oilbath in the switching tank shown in Figure 1 and more fully described previously.

The contact 106 comprises a U-shaped spring supporting contact member supporting a pair or" contacts 116 by means of a swivel support 117 that permits a free swivelingmovement ot the contacts. The contacts 116 are adapted to receive the errule of a Schweitzer & Conrad fuse between them. The ierrule 118 of the 'fuse is a metallic cylindrical member having tlat contacting surfaces on the opposite sides thereof for engagement by the contacts 116. An upstanding lug 119 limits the downward movement of the lower end of the fuse ferrule and a spring member 120 is provided tor additionally guiding the lower end of the ferrule. As previously stated the fuse is a standard Schweitzer & Conrad type of fuse although the invention is not limited to such a type Ot fuse and it is understood that any other form of fuse may be used. The fuse comprises a glass tubeencasingr the fusible element, said fuse being lilled with a suitable arc quenching insulating liquid such as carbon tetrachloride or the like, the fuse element within the tube 126 being connected at the lower end to the metallic errule 118 and at the upper end to a metallic ferrule 127, said ferrules constituting the means for establishing a circuit through the fuse.

At the upper end of the tube 100 are mounted a pair of spring pressed contacts 130 each supported by a spring member 131 so as to have freedom of motion to adjust itself into proper engagement with the outside of a chuck member that holds the upper errule 127 in a manner to be presently described.

The fuse 125 is mounted in the chuck and is then inserted through the top of the fuse holder 78 until the lower ferrule 118 is engaged by the contacts 116 at which time the chuck will be engaged by the contacts 130 thereby establishing a circuit through the upper ferrule. A ring 135 of suitable insulating material is provided for guiding the end of the lower ferrule 118 into the contacts 116. The ring 135 is in this instance made ot suitably treated maple wood and is provided with a conical opening 136 for guiding the ferrule.

A description will now be given of the Leanser;

chuck for gripping the upper Jferrule 127 of the fuse. A bar 140 has a pair of clamping jaws 141 and 142 pivoted to it at 143 and 144 respectively. The jaws 141 and 142 are ridentical and each comprises a pair of similar members 145 and 146 rigidly secured together in spaced relationship by rivets 147 and 148. The lower ends of the two jaw members 145 and 146 extend into notches 150 and 151 in a contact j aw 153 which may be of brass or any other suitable conducting material.

A pin 154 extends through the contact jaw and pivotally connects the contact jaw with the low-er portions of the members 145 and 146. A bolt is slotted at its lower end and pinned to the member 140 by means of a pin 161, a. limited amount of angular motion between the members 140 and 160 being permitted. A cone member 163 having a cenw tral bore therein is keyed on to the bolt 160 and is freely slidabl-e upon the bolt. Itis ap parent from Figures 2 and V4 that if the cone member 163 is forced downward, it forces the upper ends of the jaws 141 and 142 apart, thus moving the lower ends of those jaws, that is the ends whereon the contact aws 153 and 165 are mounted, inward. The upper end of the bolt 160 is screw threaded and extends into an insulator' 168 which is provided with a central metallic plate extending therein and internally threaded. As previously stated,

the cone 163 is Jireely slidable along the bolt 160 and therefore as the insulator 168 is turned downwardly upon the bolt, it forces they cone member downward, thereby forcing the upper ends of the arms 141 and 142 outwardly and the lower ends of those arms inwardly. A handle is rigidly secured to the top of the insulator 168, a metallic plate 171 being interposed between the handle 170 and the insulator. The plate 171 has a number of spring metal contacts 1.72 secured to the top thereof, said metal contacts being provided in order to ground the upper portion ot the insulator when the fuse holder is in position within the tank as will be presently described. f

When the fuse holder 78 is immersed in the oil tank, the fuse may be inserted into the fuse holder as follows:

`With the handle portion 17 0 and the accompanying insulator and chuck mechanism outside of the switching tank, the handle 170 is turned with respect to the bolt 160 to permit the conical member 163 to be drawn back and thereby permit the upper ends of the chuck aws 141 and 142 to be drawn together and spread the lower ends of the chuck. A fuse is then inserted between the jaws 153 and 165 so that those last mentioned aws enthe upper 'errule 127 of the fuse. Stops limit the extent to which the ferrule 127 may be inserted between the jaws. The fuse 125 herein used has a ierrule 127, the end of which is cylindrical and has two beveled portions, on opposite sides, presenting fiat surfaces to the jaws 153 and 155. The insulator 168 is then turned about the bolt 160 thus forcing the cone 163 downward between the upper ends oi the jaws 1411 and 1112, thereby contacts and into f irin 'th the ends of the Qerruie with the fuse 125 irnily held en by the handle 1Y0 and 'he fuse heid-er, into the fuse solder 125 descends into the fuse hofx is pushed between jaws 116 held at the b r1`he fuse is now in and the cover above ci be ciosed. is previously stated, the iowV terruie 11S is cyiindrical and is plan/od of? provide nat surfaces on the opposite si:V thereof for engagementby the Contact 116. 1t is therefore necessary that t be inserted into the hoider with the ila ta es the inse disposed in such a as to engage t1 e contacts 1123. ifo insure proper disposition o1 the fiat surfaces or ierrule with respect to the contacts w i .i the fuse is bein .owered into the fuse Lolo.-

er, the shell 10G of the fuse holder is prov d i h two oppositely disposed siots 181 and 1 et the upper end thereof. When the cnuci: and the fuse held therein are lowered into the fuse hoider the bar 111-() inust pass downward into trie slots 181 and Then is is done the position o'j t edges with respect to the shell 10G, and therefore with respect to 'the contacts 11G, is fires t by aecureteiy locating` the angular of the lower ferri Ae with respect to thes contacas. This is so since the anguiar position ot the fuse with respect to the chucl; at the chuck jaws 158 and 165 is accurately ined due to the fiat surfaces of' the upper errule engaging; the chuck jaws.

The contact aws 153 and 165 are in-' pressed against the terrule 107 b ssed contacts 1301113 ted wi ier as previously expiained. Vhe "ontacts 130 are connected to a copper rino; 190 hy nieans ot 'die loads 191. A circuit to .ned by et a forked c is adanted to be pushed into engagement with the ring- 190. The clip and the manne'1 in which the saine pinces about the contact ring 190 is shownv pertieulari' Fi 5 and 7. The clip Q comprises a pei j: 1". 4 Uhe ruse is este. ns

i p :7200 which spring;l iaws of a the jai ot a switch.

, einbrace the contact rings 1.10. A. threaded bolt E205 secured to the upper end et the clip Q01 and constitutes the ans for insert'vi rino' the Clip rein the contact lonrhictor having a i pressed thereupon, is held upon tion o1' the clip 201 by a nut 208. The iexible conductor o5 is connected to the lower end et trie pothead as indicated in Figure 1. 'ijhe jaws 201 or" the clip ein race a flat poroit the ringl 190 and thereby establish ween the conductor gg 'unl-1 through the are secured to the 100 and serve to guide ii to engagement with the conoi the Contact ring` 190. be vioient blowing of the .id breair the glass tube oil tank shown in Figure 1 in i broken glass `from the the fuse holder. ss, as weil as the lower fer- Y l K`noved, of course, from the fuse hoider bef e a new fuse can he inf 'ed into piece. To remove the fuse holder oni the te 'i tool such as shown in Figure i) is ised. '1 avoids the necessity of reaching d i wn into the ori of the oil tanl with the 1, 7

hand. To reinove the fuse and fuse holder the cover 92 of Figure 1 is opened and the chucl s cnred to the insulator 16S and as much or" the fuse as is held in the 1ril' reinoved by manually gripping the ndle 170 and pullingl the sanie outward troni the oil tank. The tool of Figure 9 then inserted into the oil of the tank shown in Figure 1 and the end 231 of that tool, comprises standard nut, is threaded onto the boit 205 in the manner shown in Figure 5. Then the nut 281 has been threaded upon the bolt a sufficient amount7 the tool is puiled npwerd thereby withdrawing G0 troni the contact ring 190. The

lower end of the pothead may then 4be unthreaded and withdrawn 'from the e 1in 200 is placed upon the ineniber in order to locate it in i definite position 'for engagement by the nut 231 when the @eine is to he reinserted in place on the holder after the saine has been renioved The other end of the tool Q30 then insel ed into the oil tank and the cross rod ineniber is inserted into the fuse holder with the ends 236 thereof passing sfot 181 in the fuse holder.

t 181 constitutes one portion of a 'formed in the fuse holder tube rneinbcr Q35 is inserted into this he ends thereof rest in the A disc inernber 240 of maple or other suitable material is mounted upon the tool 230 and is slidable thereon. The

' forces the rneinber 240 into the eure 9. As the tool is inserte]L into the bayonet joint, the member sind reinserted.

i rl`his is fully descril.

2110 butts the top oi the tube 10() and upon further insert-ion oiI the tool into the joint the member 240 slides along the tool, placthe spring 241 under compression. The spring? 241 thus serves to maintain the rod 235 firmly in place in the joint. lV ith the tool firmly inserted into the joint, the tool is turned thereby turning the tube 100 and with it the spindle 107 and the look nuts 106 and 109 held thereon. The spindle is thus turned out ot the insulator 77 and may then be wi idrawn from the oil tank shown in Figure 1 through the open pipe 91. rlhe Jruse holder may then be cleaned as desired and may then be reinserted in place in the same manner in which it was removed. Upon inthe fuse holder in place the holder is tuned by means of the tool 230 to thread the bolt or spindle 107 into the insulator 77. The luso holder is turned until the lock nuts 108 and 169 against the member 110.

These l ck nuts are adjusted upon the bolt 10",7 so that this amming takes place when the por bion 215 (Figure 7) of the tube 100 is opposite the member 56 (Figure 1) at the lower end ot the pothead. The tool is then removed from the bayonet joint andthe other end ot the tool is inserted into the oil tank and the nut 231 is threaded upon the bolt 205 ot the fuse clip 260 which is now held upon the member 56 in the oil tank. rllhe clip may then be withdrawn from the member 56 and inserted upon the member 215 et the contact ring 190. l

'lne tool is then removed from the oil tank and the fuse holder' is now in condition to receive a fresh fuse.

A plato member 169 (Figures 2 and 6) is secured to the conical member 163. This plate i iember has a dual function. l"Vhen the chuck holdino the fuse is inserted into the fuse holder, the plate member 169 butts nst the upper portion oi' the bolt 205 and clip 20() has not been fully inserted n the contacting portion 215 ot the ring 190, tiis plate 169 jorces it downward into rlrm engagement. In addition. this plate prevents the insertion ot the tool shown in Figure 9 to the clip 200 while the fuse holding` chuck is in place.

lt is be noted that to remove the fuse or to insert the same in position the coverl 92 must opened. Suitable interlocks are provided fior preventing' the opening' ot the cover while the circuits within the tank are alive.

in my par-ent application t-o which reference may be had. As an additional safety measure it is to be noted that the spring members 172, which may be ol bronze or other suitable conducting materiah engage the pipe section 91 as may be seen in 1ligure 1, thereby grounding the upper portion of the fuse holder rendering the manipulation of the tus-e perfectly sate.

An alternative structure for gripping the upper end ot the fuse for inserting' the same Lecc/gees into the fuse holder 7 8 is shown in Figures 10 to 1e inclusive. This tuse holder compi'ses tube 260 ol copper or other suitable conducting material bored out at the bottom portion to provide a shoulder as indicated at 261 to receive the tu per ierrule oi a fuse. Two rectangular' holes are Yformed on opposite sides ot the tube 260 at the lower portion thereof for receiving a pair ot cont-act jaws 263 which may be male ot brass or any other suitable electrical conducting material. A pair of ilat clips 264 and 265 are secured to trie tube 260 on opposite sides ot the rectangular holes. The clips are bent at 269 and serve to retain the contact jaws within the slots in the lower portion ot the tube 260 as will be presently pointed out. l hole or slot 266 is termed in each oithe bent in holdportions 269 of the clip 26e. The contact .ws each have two pins 270-and 271 eX- nding therethrough. The fuse 125, shown dotted line in Figure 11, is inserted into e 260 until the upper end of the upper butt1 against the shoulder 261. The ontact jaws 263 then inserted iito the rectaneul r openings in the tube 2607 the up- 270 passing through the slots 268 in he members 264 and the low-er pins 271 passng below the lower end of the member` 2611.

Vh n the jaws have been inserted into a position to engage the contacting' surface ot the ferrule the jaws are pushed upward a slight amount so that the pins 270 and 271 assume the position shown in Figure 11. A nut 275 is then threaded onto the lower portion oit the tube 260 to support the aws 263 in an elevated position. The members 26e and 265 prevent the withdrawal of the contact aws 266 unless the same are i'irst pushed downward sov that the pin 270 may pass through the slot 268 and the pin 271 may pass below the member 26d. This cannot be done until the nut 275 is turned downward. lt may thus be seen that the contact jaws 263 are held against the ferrule of the fuse and the ruse is thereby held against downward removal from the :tuse holder. A pair ot lieXible copper ribbons 276 hold the aws 263 against misplacement when the aws are rei moved from the openings inthe tube 260. The ribbons 276 are secured to the tube 260 by suitable screws or the like. A bail 278 is secured to the member 2641, and locking lu g 279 is loosely and slidably held in a slot 277 therein. rlhe nut 275 is provided on its outer surface with number ot spaced notches 260 and when the nut is being turned on or oil' of the tube 266 the lug1 279 is pushed upward through the slot so as to be out oit the path of mot-ion of the nut. llfhen the nut has been screwed into position it turno l around so that one oit the notches 286 is immediately beneath the member 279, and the member 279 is then allowed to drop down through the notch 280 thereby holding the nut 27 5 against turning.

To remove the nut 275 the lug is Laised out of the notch, thereby permi is); the i ing of the nut 275. it. metal member 283 having projecting` arms 284F to the tube Vvlhen t`= fi and 11 is ser-ted into the tubular hold` r 1GO of Figure 2 the arms 28% and pas through the slots 181-182 for locating the wngi position oi the fuse within the inse hoi has previously pointed out. il l t l member 287 is blazed or otherwis to the toi of the tube 260 it pose of the member 169 shown in Figures 2 screw 290 secured to the screw being` adept-d sulator such as the lisuiat 2 and 3 which insulator supports a handle portion such as is shown in Figures 2 and 3. A handle such shown in Figures and 3 is threaded onto the screw fuse held in the holder may into the tube 100 of h`i :'f.ircV` same manner as was the chuck scribed in connection with thos der these conditions the spri tact jaws 130 shown in Fig against the Contact jaws 233 to a ein cuit between the tei-rule i' the inse and. the lclip 200. Rectangular ope` 293 holder it i i im a i.. from the screw 290 v-.nen the inte has een fri i i Vc inserted into place. Jine na die, er iwould include t insulator 163 oi figure .a and the portions of 'the appara-tus abore that insulator. is of course understood that if desired inc ividual handfes may be provided ior cach of the fuse holders.

The fuses here sed are Schweriner Conrad fuses as previ -usly statedi although the invention is not united to the use o' of any particular design. rEhe upper rerrule oithe fuses is provided with an explosion cap at the upper enf,L thercer", which cap may be blown outward during` the blowing of the fuse. In connection i the fuse holder it must be noted that the ulder in 'the tube 260 is of such a sire not to interfere with the upward movement of the ci. l cap when the saine is blown out this respect the fuse holder shown in ures 2 and 3 for in the fuse holder shown in Figures 2 and 3 the member 140 may interfere with the :tree expulsion of the fuse cap.

Reference may now be had more particularly to Figures and 16 wherein I show a fuse holder adapted to hold a somewhat specifically dilferent type of S and C fuse. This type ot fuse holder is particularly adapted for use in connection with fuses wherein the vent cap that is adapted to be blown when the fuse interrupts an exceptionally heavy short circuit extends to substantially the periphery of the top portion of the fuse. The glass fuse is indicated at 301 and is provided, at its top, .vith a ferrule 302 similar to the ferrule 127 of the fuse previously described. This last mentioned ferrule includes a vent cap 3011 which is adapted to blow when the fuse is blown by an exceedingly heavy short circuit. This cap extends clear to the periphery of the ierrule, or so near to the periphery thereof that for the purposes or' my fuse holder it may be se consi dcred.

The inuse holder proper includes the tube 100t which is of a construction substantially identical to the tube shown in Figures 2 and 3 and is mounted in substantially the same manner. This tube 100 is provided with a contact` ring 190 adapted to receive a contact clip 238, as previously described. The fuse chuck or gripping moans comprises a tube 310 which may be made of steel or other suit-able mat rial, said tube being provided with two radially outstanding arms 311 and 312 that adapted to enter the slots 181 and 182 of tube 100 in the manner previously described. In addition this tubular chuck 310 provided with a pair of extensions 314 and 5, either one or which is adapted to force lic contact clip 200 downward into irm en- 0'agement with the contacting portion of the contact ring 190 and to prevent withdrawal of 'he contact clip as long as the fuse holding luck is in place.

The fuse holding chuck 310 is provided, ad-

nt its bottom portion, with two substanlu rectangular slots 318-318 into which contact blocks 320 and 321 may be inserted for agement with the contacting portion of Y; upper ferrule 302. rfhe contacting blocks l and 321 are provided with pins 325 and fi, respectively, said pins extending through the contact blocks and projecting outwardly therefrom at both ends thereof. The fuse is iii-st i' `ierted into the chuck and thereafter the contact blocks 320 and 321 are inserted "hrough the rectangular openings 318 in the nbular member 310 to hold the fuse against iownward withdrawal. After this has been one, a pair olf clamp links 328 and 329 are inserted over the ends of the pins 325-326 to hold the contact blocks against withdrawal 'trom the slots 318. Cotter pins 331 may be provided for retaining the clamp links 328 and 329 in place.

in order to mount the fuse Within the tube l0() l provide a handle structure similar to the handle structure shown in Figures 2 and 3 and mounted upon the insulator 168. This insulator has a spacer member 34a-O secures. thereto. rlhe spacer member includes a stud portion 3dr-l that is threaded at its upper end and threads into a tapped opening in the insulator 153. Tl is spacer member is also provided with an integral flange adjacent the top thereof. rlhe spacer member 3a() is adapted to be thi' aded into the tapped hole in the insulator 163 until the flange 3&2 engages with the bottom ot the insulator. Thereafter a pin driven through a hole in the flange member 3412 and into an aligned hole in the bottom of the insulator 163, thereby serving toprevent turning of the insulator 168 with reference to the spacer member. The nge 342 is externally threaded. i cap i ein er glil5 is formed integrally with the spacer member at the bottom thereof and is of a concave shape at ehe bottom thereof conform with the shape of the top of the vent cap 304i. By turning the handle oiE the insulator 168,'the flange 342 may be threaded into engagement with corresponding thread at tl e top of the chuclr member 310 until the cap portion 34:5 engages the vent cap 301i of the iuse. rllliis therefore holds the fuse' against upward motion Within the chuclr 310. The handle of the insulator may noW be gripped and the fuse lowered into engagement with the lower 'ferrules in the tube 100 in manner such as has been previously described in connection with Figure 2.

it that time the outer sides of the contact blocks 320 and 321 Will engage the upper spring contact ngers '1,30 that are permanentlv connected -with the contact 130. rlhe fuse now in position. Before operations can ined it is necessary, in this iorm of mv in to remove the insulat r i655 and ii'ith it th i spacer Al and the cap portion rlhis may be done by merely gripping the handle ot the insulator and turning the salue until the thread on the iiange portion 341-2 threads out of engagement with the thread at the top of the chuclr member 310 whereupon te insulator 158, together with the spacer 340, may be raised outside oi the swit zi This is es en-tial in order to per-nit ree blowing of the vent cap 304 in the o the occurrence of a very short t. lt is to be noted' that such action is not possible long as the spacer member 340 is in place Within the chuclr and is for this reason'that the spacer member must be removed trom the chuck, in order to ult'- mately remove the fuse from the tube 1GO, it is merely necessary to again lower the spacer member 3- into the chucli 3l() and after threading the flange 342 into the chuck 310, the chuc, together with the fuse, may be raised and l f inmoveo .from the tube.

What consider' new and desire to secure by Letters Patent is l. A. fuse holder comprising a supporting ,d base, tubular casing removably rted on said base, a fuse clip in said for receiving one end' of a fuse, a fuse holdingl niemeer ier gripping the other end of the fuse and inserting it into the tubular casing, contacts engaging the fuse holdir memberv` and means associated with the anc with the Jfuse holding member for ii j the radial position of the member in the casing.

A Yinse holder comprising a supporting insulated base, a tubular casing removably supported on said base in a predetermined radialposition, fuse clip in said casing for I' one d of a fuse, a fuse holding mber for gripping the other end of the so and inOp it into the tubular casing, spring contacts engaging the fuse holding l means associated with the casing .Y Y theli'use holding member for fixing the ref Lal position of the member inthe casing and thereby insuring a proper radial position oi end oi" the fuse with respect to the fuse clip, and a removable clip for establishne' a connection to said spring Contact memkiers.

the

s holder comprising a supporting insulated lase, a tubular casing removably supported on said base, a fuse clip in said for receiving one enrL of a fuse, a fuse holding member for gripping the other end .o and inserting it into the tubular n, spring contacts engaging the fuse holding member, means associated With the casino' and with the :tuse holding member for the radial position of the member in the Casin y und thereby insuring a proper radial nos: Aon et the end of the fuse With respect to the fuse clip, a second clip for establish- 'ing a connection to the spring contacts and l ,t insulation, a stationary support upon weich tie tube is removably mounted, said tube including an electrical contact receiving member, and means for fixing the radial position of the contact receiving member with reference to the support When the tube is mounted on the support, said support being mounted in a bath of insulating liquid Which is adapted to also submerge the tube of insulation.

5. fuse holder adapted to be immersed in a bath of insulating liquid and comprising a support, a tube of insulation removably mounted on the support and extending up- Wardly therefrom and arranged to permit the liquid of the bath to substantially fill the same, and means Within the tube of insulation for gripping a fuse, said tube being formed adjacent the top thereof for receiving a tool for mounting and removing the tube upon the support While the support is immersed in the bath of liquid.

6. A fuse holder' comprising a tube of insulation, yielding contacts mounted at the opposite ends of the tube on the inside thereof for yieldingly gripping the ends of a fuse and establishing a circuit therethrough upon the insertion of a fuse into the tube, and a removable contact clip extending partly into the tube and adapted to extend the circuit to the upper yielding Contact.

7. A fuse holder comprising a tubular member adapted to receive a fuse, a Contact clip removably mounted on the member for extending circuit connections thereto, a fuse and fuse supporting means adapted to be inserted into the tubular member, and means carried by the fuse supporting means for forcing the clip into position upon the insertion of the fuse holding means into the tubular member.

8. A fuse holder comprising a tubular member adapted to receive a fuse, a contact clip removably mounted on the member for extending circuit connections thereto, a fuse and fuse supporting means adapted to be inserted into the tubular member, and means carried by the fuse supporting means for forcing the clip into position upon the insertion of the fuse holding means into the tubular member, said fuse holding means being removable from the tubular member independently of the contact clip and preventing the removal of the Contact clip While the fuse holding means is in position in the tubular member.

9. In combination, a tube of insulating material adapted to be mounted in a bath of insulating liquid and open to the liquid of the bath, contacts in the tube, and a fuse comprising a tube of insulation having a fusible element therein, said fuse being mounted Within the first mentioned tube and spaced from the cylindrical Wall thereof and having ferrules movable into engagement with at least one of the contacts in the first mentioned tube.

10. In combination, a tube of insulating material adapted to be mounted in a bath of insulating liquid and Open to the liquid of the bath, contacts in the tube, a fuse comprising a tube of insulation having a fusible element therein, said fuse being mounted Within the first mentioned tube and spaced from the cylindrical Wall thereof and having ferrules movable into engagement with at least one of the contacts in the first mentioned tube and means including a removable contact member for establishing an electrical connection to one of the contacts of the outer tube.

11. In combination, a tube of insulating material adapted to be mounted in a bath of insulating liquid and open to the liquid of the bath, contacts in the tube, a fuse comprising a tube of insulation having a fusible element therein, said fuse being mounted Within the first mentioned tube and spaced from the cylindrical Wall thereof and having ferrules movable into engagement With at least one of the contacts in the first mentioned tube, means including a removable contact member for establishing an electrical connect-ion to one of the contacts of the outer tube, said outer tube being of an appreciably larger inner diameter than the outer diameter of the fuse, and means Within the outer tube for guiding the loiver fuse ferrule into engagement With its contact.

l2. In combination, a tube of insulation adapted to be removably mounted in a bath of insulating liquid, a contact mounted in the tube, a removable contactl clip for establishing electrical connections` to the contact, said clip being removable to permit removal of the tube from the bath of insulating, an electrical device, and means for inserting the electrical device into the tube and establishing a circuit between the device and the first mentioned contact.

13. In combination, a tube of insulation adapted to be removably mounted in a bath of insulating liquid, a contact mounted in the tube, a removable contact clip for establishing; electrical connections to the contact, said clip being removable to permit removal of the tube from the bath of insulating, an electrical device, and means for inserting the electr'cal device into the tube and establishin@` a circuit between the device and the first mentioned contact, said means including means for preventing removal of the contact clip While the electrical device is in position in the tube.

14. In combination a fuse, current carrying blocks and holding means therefor for releasably gripping one end of the fuse and constituting a terminal for the fuse, a fuse liolder having Contact making means therein, said fuse being inserted into the holder With the current carrying blocks in engagement with said contact making means, and means for insuring a proper radial positioning of the fuse upon the insertion thereof into the fuse holder.

15. A fuse holder comprising fuse gripping means adapted to hold a. fuse in a predetermined position fixed against radial motion, a tube of insulation into which the fuse is adapted to be inserted by the gripping means, and means carried by the fuse gripping means for insuring a proper angular positioning of the fuse upon the insertion thereof into the tube.

16. In combination, a fuse including a sealed tube containing a fusible member adapted to blow without breaking the seal upon the occurrence of a small ov-erload and to blow and break the seal upon the occurrence of a large overload, a bath of insulating liquid within which the sealed tube is immersed whereby upon the breaking of the seal the liquid of the bath is available to quench the resulting arc, and a second tube of insulation surrounding the sealed tube in spaced relationship thereto and open to the liquid of the bath, said second tube receiving the products of the violent blowing of the fusible element.

17. In combination, a fuse including a sealed tube containing a fusible member adapted to blow without breaking the seal upon the occurrence of a small overload and to blow and break the seal upon the occurrence of a large overload, a bath of insulating liquid within which the fuse is immersed whereby upon the breaking of the seal the liquid of the bath is available to quench the resulting arc, and a second tube of insulation surrounding the fuse in spaced relationship thereto and open to the liquid of the bath, sai d second tube receiving the products of the violent blowing of the fusible element, said second tube being removably mounted in the bath of insulating liquid.

18. In combination, a fuse including a sealed tube containing a fusible member adapted to blow without breaking the seal upon the occurrence of a small overload and to blow and break the seal upon the occurrence of a large overload, a bath of insulating` liquid within which the fuse is immersed whereby upon the breaking of the sealthe liquid of the bath is available to quench the resulting arc, a second tube of insulation surrounding the fuse in spaced relationship thereto and open to the liquid of the bath, said second tube receiving the products of the violent blowing of the fusible element, said second tube being removably mounted in the bath of insulating liquid and entirely submerged therein, and tool means for removing the second tube of insulation from the bath without the necessity of inserting the hands in the bath of insulating` liquid.

19. A fuse holder comprising` a pair of arms pivoted intermediate their ends, contact blocks mounted at one end of each of the arms and means adjacent the other ends of the arms for spreading those ends apart thereby forcing the Contact bearing ends of the arms towards one another to grip an object inserted between them.

20. A fuse holder comprising a bar member, a pair of arms pivoted to the bar member intermediate the ends of the arms, contact blocks mounted at one end of each of the arms, and means mounted on the bar member between said arms for spreading the opposite ends of the arms for moving the contact blocks towards each other.

21. A fuse holder comprising a bar member, a pair of arms pivoted to the bar member intermediate the ends of the arms, contact blocks mounted at one end of each of the arms, and means mounted on the bar member between said arms for spreading the opposite ends of the arms for moving the contact blocks towards each other, said bar extending beyond the pivoted arms and constituting guiding means for guiding the fuse holder as it is inserted into place.

22. A fuse holder adapted to grip the ferrule of a fuse having a metallicferrule at one end, said holder comprising a tube member into which the ferrule of the fuse is adapted to be inserted, means for limiting the extent of insertion of the ferrule, said tube having an opening in the side thereof, and a contact making member removably inserted into the opening and making contact with the ferrule for establishing a circuit thereto.

23. A fuse holder adapted to grip the ferrule of a fuse having a metallic ferrule at one end, said holder comprising a tube member into which the ferrule of the fuse is adapted to be inserted, said tube including means for limiting the extent of insertion of the ferrule, said tube having an opening in the side thereof, a contact making member removably inserted into the opening and making contact with the ferrule for establishing a circuit thereto, and means mounted on the tube for locking the contact making member in position.

24. A fuse holder adapted to grip the ferrule of a fuse having a metallic ferrule at one end, said holder comprising a tube member into which the ferrule of the fuse is adapted to be inserted, means for limiting the extent of insertion of the ferrule, said tube having an opening in the side thereof, a contact making member removably inserted into the opening and making Contact with the ferrule for establishing a circuit thereto, and i ber into which the ferrule of the fuse is adapt- Y ed to be inserted, means for limiting the exerrule for permittA ig the escape of gaseous products of a circuit interruption.

26. A fuse holder for gripping a fuse of the kind having a rrule at its upper end which errule is pro idcd With an explosion cap, said fuse holder comprising a tubular member open at the bottom for receiving the fuse ferrule, said tubular member haring means therein for limiting the erteilt oi' insertion. et the errule, said means being free of interference with the explosion cap when the same blows.

27. In a tank containing electrical apparatus and fuse in circuit therewith all immersed in a bath of insulating oil and Wherein the fuse is adapted t blov7 in the oil under predetermined conditions, means 'for preventing contamination ot the tank by the products resulting from the blowing of the fuse in the oil, said means comprising a tube ot insulation spaced 'om and surrounding the fuse to catch the products resulting from the blowing of the fuse, said tube being open to the liquid Within the tank whereby this liquid is available for quenching the arc that may form upon blowing ot the Jruse.

28. fuse holder comprising a hollow tube having contact clips within the same at its opposite ends, means at one end of the tube for removab Y inounting` the same and establishing electrical connections to the adjacent clip, a separate clip movable into and out of engagement With the fuse holder When the Jruse holder is mounted in position independent or" moi/'ement of the 'fuse holder, said separate clip establishing a circuit to th other clip in the fuse holder` and a fuse removably held betiveen the clips in the fuse holder.

29. A device of the character described comprising a tank, a fuse containing member removably mounted therein, an insulated bushing` structure through Which a lead in conductor extends into the tank, a flexible conductor secured to the end of the lead in conductor, and supporting a terminal clip, said terminal clip being movable into engagement with the fuse containing member when said member is in pos `on, and said clip being removable from engagement with said member to permit removal oi said member from the tank.

30. A tank containing an insulating, arc quenching liquid, a Jfuse support therein, a fuse containing member mounted at one end on said support and substantially entirely immersed in said liquid, and means for eX- tending an electrical connection to the opposite end et the member, said means comprising a flexible conductor having a contact clip secured to the end thereof, said contact clip being otherwise free of mechanical support, and said member including a contacting portion to which the clip may be connected after the fuse containing member has been inserted upon its support, said clip being removable rom the fuse containing member independe -tl-.y oi movement of the member.

31. A tank containing an insulating, arc

quenching liquid, a fuse support therein, a fuse containing member mounted at one end on said support and substantially entirely immersed in said liquid, means for extending an electrical connection to the opposite end of the member, said means comprising a flexible conductor having a Contact clip secured to the end thereof, said Contact clip being otherwise free of mechanical support, and said member including a contacting portion to which the clip may be connected after the fuse containing member has been inserted upon its support, said clip being removable from the ifuse containing member independently of movement ot the member, and a supportior receiving the clip and holding the same in a predetermined position when it has been removed from the contacting por tion on fuse containing member.

n, fr tank containing insulating liquid, a *u e holder removably mounted in said tank nl substantially entirely immersed in the iquid, contact clips in said fuse holder, a fuse removably held in said contact clips, said fuse holder beine' in a substantially vertical position and including means adjacent the top thereof whereby it may be gripped for insertion into the tank or removal therefrom, and means for insuring a predetermined radial positioning of the fuse holder in the tank.

33. A tank containing an insulating arc quenching liquid and a pair of spaced terminals, a fuse holder removably mounted in said tank between said terminals and substantially in and open to the liquid, contact clips Within the fuse holder, means electrically connecting the contact clips with the terminals, and a fuse including a sealed tube having Contact ferrules, said fuse being removably held. Within said fuse holder with the errules thereor'l in said clips.

In Witness Where-of, I hereunto subscribe my name this 28 day of August, 1930.

ERNST BLOMQUIST. 

